基于Simulink的GMSK跳频通信系统设计

为了寻找最佳跳频调制方式,通过分析各种调制方式下不同信噪比对误码率的影响和不同BT值对GM-SK(Gauss filtered Minimum Shift frequency Keying)调制系统误码率的影响,说明GMSK调制方式的合理性和必要性。经仿真得出,在低信噪比-4 dB条件下,系统选用GMSK方式可获得0.03%的误码率,优于2FSK(2-ary Frequency Shift Keying)(3.33%),略差于BPSK(Binary Phase Shift Keying)(0.017%)和MSK(MinimumShift frequency Keying)(0.02%);同时频带利用方面GMSK为最优。利用Matlab中的Simulink通信工具箱模拟仿真GMSK跳频信号的调制与解调过程,设计出一种GMSK跳频通信系统。测试结果表明,该系统可在没有差错控制的条件下得到误码率为0.5%的通信效果,解决了由于器件和传输信道影响产生的衰耗和偏差补

Design for GMSK Frequency-Hopping Communication System Based on Simulink

To seach the best mode of freqyency-hopping modulation,the thesis compares with some digital modulation modes and the factors affecting the error rate of systems is analysed,which include different SNR(Signal Noise Ratio) in each mode and different BT values of GMSK(Gauss filtered Minimum Shift frequency Keying) modulation systems.The error rate is 0.03% under SNR is-4 dB,when the system adopts GMSK modulation.It is better than 2FSK(2-ary Frequency Shift Keying)(the error rate is 3.33%),while it is worse than BPSK(Binary Phase Shift Keying)(the error rate is 0.017%) and MSK(Minimum Shift frequency Keying)(the error rate is 0.02%).GMSK is optimal on the utilization of frequency band.The result indicates that GMSK modulation mode is reasonable and necessary.The modulation and demodulation of GMSK frequecy-hopping signals are simulated by Matlab 's Simulink communication module base.Finally a feasible GMSK frequecy-hopping modulation system is designed.